Shrub rose plant named ‘KORbaymun’

ABSTRACT

‘KORbaymun’ is a new and distinct variety of  Rosa hybrida  which is characterized by the combination of an upright and bushy growth habit, a moderately vigorous rate of growth, panicles bearing one to five white flowers suffused with red and irregularly striped and margined red, semi-double flowers with light fragrance, and excellent resistance to common rose diseases. The new variety propagates successfully by stem cuttings and grafting and has shown to be uniform and stable in the resulting generations from asexual propagation.

Latin name of genus and species: The Latin name of the genus and speciesof the novel variety disclosed herein is Rosa hybrida.

Variety denomination: The inventive variety of Rosa hybrida disclosedherein has been given the variety denomination ‘KORbaymun’.

STATEMENT REGARDING PRIOR DISCLOSURES BY THE INVENTOR UNDER 37 C.F.R.1.77(B)(6)

The first public disclosure of the claimed plant was made on Aug. 21,2015 at a public ceremony in Schuttringen, Luxembourg where cut flowerstems were displayed by the inventor, but not sold or otherwisetransferred. The claimed plant was not specifically identified by namein the display. ‘KORbaymun’ was not publically available or sold priorto one year before the date of the instant application.

BACKGROUND OF THE INVENTION

Parentage: The Rosa hybrida variety ‘KORbaymun’ is the result of acontrolled cross-pollination breeding program carried out by theinventor in Klein Offenseth-Sparrieshoop, Germany. The objective of thesaid breeding program was to create a new and distinct rose plant withunique qualities, such as:

-   -   1. Uniform growth habit and uniform flowering; and    -   2. Abundant, recurrent white flowers suffused with red; and    -   3. Attractive and abundant foliage; and    -   4. Resistance to diseases encountered in landscapes and gardens.        This combination of qualities is not present in prior rose        cultivars known to the inventor. These objectives have been        substantially achieved and in that distinguish ‘KORbaymun’ from        all other varieties known to the inventor.

‘KORbaymun’ is a seedling selection which resulted from the controlledpollination of Rosa hybrida ‘KORschwill’ (U.S. Plant Pat. No. 23,122),the seed parent, and Rosa hybrida ‘MACcastler’ (unpatented), the pollenparent, during the summer of 2007. As part of a rose developmentprogram, Tim-Hermann Kordes germinated seeds from the aforementionedhybridization during the following winter and conducted evaluations andobservations on the resulting seedlings in a controlled environment inKlein Offenseth-Sparrieshoop, Germany. The resulting seedlings exhibiteddistinctive physical and biological characteristics. The new rose plantwas selected as a single plant in May of 2008 from the seedling beds dueto its superior characteristics and asexually propagated for furtherevaluation. This new and distinctive rose variety was given the name‘KORbaymun’.

Asexual Reproduction: ‘KORbaymun’ was first asexually propagated by budgrafting in July of 2008 at the inventor's nursery in KleinOffenseth-Sparrieshoop, Germany. Subsequently, ‘KORbaymun’ has beensuccessfully propagated by stem cuttings and bud grafting in JacksonCounty, Oreg. These initial and other subsequent propagations conductedin controlled environments demonstrate that ‘KORbaymun’ reproduces trueto type in successive generations of asexual reproduction.

SUMMARY OF THE INVENTION

The following characteristics have been repeatedly observed andrepresent the distinguishing characteristics of the new Rosa hybridacultivar ‘KORbaymun’. These traits, in combination, distinguish‘KORbaymun’ as a new and distinct cultivar.

-   -   1. Rosa hybrida ‘KORbaymun’ exhibits a moderately vigorous        growth rate; and    -   2. Rosa hybrida ‘KORbaymun’ exhibits an upright and bushy growth        habit; and    -   3. Rosa hybrida ‘KORbaymun’ exhibits panicles bearing one to        five white flowers suffused with red and irregularly striped and        margined red; and    -   4. Rosa hybrida ‘KORbaymun’ exhibits medium, double flowers with        a light fragrance; and    -   5. Rosa hybrida ‘KORbaymun’ exhibits excellent resistance to        rust, black spot disease, Botrytis and powdery mildew.

BRIEF DESCRIPTION OF THE DRAWING

The accompanying color drawing shows as true as is reasonably possibleto obtain in color photographs of this type, the typical characteristicsof the buds, sepals, reproductive organs, flowers, leaves, prickles, andstems of ‘KORbaymun’, taken from a three year old plant.

DETAILED BOTANICAL DESCRIPTION

The following is a detailed botanical description of a new and distinctvariety of Rosa hybrida known as ‘KORbaymun’, based upon observationsmade in June of 2016 from nine month old, field-grown plants in JacksonCounty, Oreg. Those skilled in the art will appreciate that certaincharacteristics will vary with older or, conversely, with youngerplants. ‘KORbaymun’ has not been observed under all possibleenvironmental conditions. Where dimensions, sizes, colors and othercharacteristics are given, it is to be understood that suchcharacteristics are approximations or averages set forth as accuratelyas practicable. The phenotype of the variety may differ from thedescriptions set forth herein with variations in environmental, climaticand cultural conditions. Color notations are based on The RoyalHorticultural Society Colour Chart, The Royal Horticultural Society,London, 2001 edition except where common terms of color are used.

A botanical description of ‘KORbaymun’ and comparisons with the parentsand closest known comparator variety of Rosa hybrida are provided below.

-   General plant description:    -   -   Growth rate.—Moderately vigorous.        -   Growth habit.—Upright and bushy.        -   Mature dimensions.—90 cm tall and 45 cm wide, on average.        -   Cold hardiness.—Grown successfully in USDA Hardiness Zones            5.        -   Propagation.—Stem cuttings and bud grafting.        -   Disease resistance.—Excellent resistance to powdery mildew            (Sphaerotheca pannosa), blackspot (Diplocarpon rosae), rust            (Phragmidium sp.) and Botrytis diseases under normal growing            conditions in Jackson County, Oreg.-   Root system:    -   -   Type.—Fibrous root system.        -   Branching.—Freely branched.        -   Density.—Moderately dense.        -   Color.—Greyed-yellow Group 161D.        -   Distribution.—Roots distributed evenly throughout the soil            profile, from shallow to deep.-   Stems:    -   -   Stem color.—Young stems are Yellow-Green Group 146B; mature            stems are Yellow-Green Group 146A.        -   Anthocyanin intonations.—Intonations of Greyed-Red Group            178A are present on young stems.        -   Stem surface texture.—Both juvenile and mature stems are            smooth.        -   Stem dimensions.—Typical mature stems are approximately 40            cm long and 6 to 8 mm in diameter.        -   Prickles.—Incidence — Typically 10 prickles per 10 cm of            stem, on average. Size — Average length is 8 mm long.            Immature prickle color — Greyed-Red Group 181B. Mature            prickle color — Greyed-Red Group 179C. Shape — Deeply            concave. Texture — Smooth.-   Leaves:    -   -   Arrangement.—Imparipinnate compound leaves; mature axillary            leaves consisting of 7 leaflets.        -   Attachment.—Petiolate.        -   Dimensions.—180 mm long and 190 mm wide.        -   Abundance.—Average; approximately 90 leaves.        -   Stipules.—        -   Size.—25 mm long and 10 mm wide.        -   Stipule color.—Yellow-Green Group 146A.        -   Anthocyanin intonations.—Greyed-Purple Group 183D            intonations are present on the center rib of the adaxial            surface and also present on the adaxial stipule surfaces.        -   Stipitate glands.—Abundant stipitate glands are present on            the abaxial surfaces and also along the margins.        -   Margins.—With stipitate glands at the apex.        -   Texture, adaxial surfaces.—Glabrous.        -   Texture, abaxial surfaces.—Leathery.        -   Apex.—Apiculate.        -   Base.—Winged.        -   Petiole.—Length — Average of 8 to 10 mm. Diameter — Average            of 3 to 4 mm. Petiole color, adaxial surface — Yellow-Green            Group 146B. Petiole color, abaxial surface — Yellow-Green            Group 146B. Anthocyanin intonations — Greyed-Purple Group            183B intonations are present on the adaxial surface; light            intonations are present on the abaxial surface. Margins —            With many stipitate glands. Prickles — Large prickles are            present on the abaxial surface. Stipitate glands — Abundance            of stipitate glands are present on the abaxial surface.            Texture — Glabrous. Strength — Strong.        -   Rachis.—Length — Average 20 mm. Diameter — Average 3.0 to            4.0 mm. Color — Yellow-Green Group 146C. Anthocyanin            intonations — Intonations of Greyed-Purple Group 183B are            present on the adaxial surface. Margins — With stipitate            glands. Prickles — A few small prickles on the abaxial            surface with a large, prominent prickle at the point of leaf            attachment. Stipitate glands — Abundance of stipitate glands            are present on the upper margins with fewer glands on the            lower margins. Texture — Glabrous.        -   Leaflets.—Dimensions — Average size of the terminal leaflet            is 75 mm long and 40 mm wide. Shape — Obovate. Apex — Acute.            Base — Obtuse. Margins — Serrated; slightly undulated.            Luster, texture and pubescence; adaxial surface —            Semi-glossy, smooth and glabrous. Luster, texture and            pubescence; abaxial surface — Matte, leathery and glabrous;            small prickles are present at the midrib. Juvenile foliage            color, adaxial surface — Yellow-Green Group 147A. Juvenile            foliage color, abaxial surface — Yellow-Green Group 147C.            Mature foliage color, adaxial surface — Yellow-Green Group            146A. Mature foliage color, abaxial surface — Yellow-Green            Group 147B. Anthocyanin intonations — Very strong            intonations of Greyed-Purple Group 183A are present on both            surfaces of the juvenile foliage; slight intonations of            Greyed-Purple Group 183A are present on the abaxial surface            of the mature foliage. Venation — Reticulate. Petiolule —            Dimensions — 3.0 mm long and 1.0 mm in diameter. Petiolule            color, adaxial surface — Yellow-Green Group 146D. Petiolule            color, abaxial surface — Yellow-Green Group 147C.            Anthocyanin intonations — Intonations of Greyed-Purple Group            183A are present on the margins. Prickles — A few small            prickles are present on the abaxial surface. Texture,            adaxial and abaxial surfaces — Smooth.-   Inflorescence:    -   -   Inflorescence type.—Panicles which bear 1 to 5 flower buds.            Flowers are held upright.        -   Blooming habit.—Recurrent; floriferous.        -   Size.—24 cm tall and 16 cm wide, on average.        -   Peduncle.—Length — 100 to 130 mm average length. Diameter —            5.0 to 7.0 mm average diameter. Color — Yellow-Green Group            146B. Anthocyanin intonations — None. Strength — Strong.            Surface — Glabrous.-   Flowering laterals: Present below the initiation of inflorescence.    Generally 1 to 2 flowering laterals are present, with 1 to 2 flowers    per flowering shoot.-   Bud:    -   -   Bud form.—Short; pointed ovoid.        -   Size.—Upon opening, 35 mm in length from base of receptacle            to distal end of bud and 20 mm diameter at its widest point.        -   Texture.—Smooth.        -   Color, as sepals first unfold.—Red Group 43B.        -   Color when one-quarter open, inner side.—Marginal zone — Red            Group 41B. Middle zone — White Group N155D. Basal zone —            White Group N155D.        -   Color when one-quarter open, outer side.—Marginal zone — Red            Group 52A, with irregular areas of White Group N155D. Middle            zone — Red Group 52A, with irregular areas of White Group            N155D. Basal zone — Red Group 52A, with irregular areas of            White Group N155D.-   Flower:    -   -   Pedicel.—Length — 70 to 120 mm average length. Diameter —            2.0 to 4.0 mm average diameter. Color — Yellow-Green Group            147B. Anthocyanin intonations — Greyed-Orange Group 175D.            Strength — Strong. Surface — Smooth, with stipitate glands.        -   Calyx.—General — Comprised of five polysepalous sepals, with            moderate foliaceous appendages present on three sepals.            Diameter of calyx — 45 mm, at anthesis.        -   Sepals.—Color, upper surface — Yellow-Green Group 147C.            Color, lower surface — Yellow-Green Group 146A. Anthocyanin            intonations — Intonations of Greyed-Purple Group 183C are            present on the lower surface. Size — 20 mm long and 9 mm            wide, on average. Apex — Cirrose and apiculate apices are            observed. Base — Flat at union with receptacle. Quantity —            Five. Upper surface — Pubescent. Lower surface — Lightly            pubescent, with stipitate glands. Margins — Pubescent, with            stipitate glands.        -   Corolla.—Habit; type — Double. General shape of corolla —            Cup-open; shallow. Shape of corolla when viewed from the            side — Upon opening, upper portion — Flat. Upon opening,            lower portion — Flat. Open flower, upper portion — Flattened            convex. Open flower, lower portion — Flattened convex.            Dimensions — Medium size for a shrub rose. When open, the            average flower diameter is 75 mm and the average flower            height is 30 mm. Fragrance — Light fragrance. Duration — On            the plant for 3 to 5 days. Senesced petals drop away            cleanly. Petals — Petal count — Exhibits double flowers with            20 to 22 petals under normal conditions. Petal reflex —            Petals are somewhat reflexed. Timing of petal reflex —            Simultaneous. Petal margin — Entire. Petal shape — Obovate.            Apex — Obtuse. Base — Obtuse. Dimensions — 40 to 45 mm long            and 40 to 50 mm wide. Texture, inner surface — Smooth.            Texture, outer surface — Smooth. Petal color, upon opening —            Outermost petals, inner surface — Primarily Red Group 46A to            46C with irregular areas of White Group 155C. Outermost            petals, outer surface — Predominantly White Group N155B with            stripes of Red Group 47A to 47C. Innermost petals, inner            surface — White Group 155D and lightly striped with Red            Group 52C. Innermost petals, outer surface — White Group            155D with irregular striping of Red Group 49B. Basal petal            spots, upon opening — No distinctive coloration at the petal            base. Petal color, after opening — Outermost petals, inner            surface — White Group N155B, and striped with Red Group 50A.            Outermost petals, outer surface — White Group N155B, and            striped with a mixture of Red-Purple Group 58B and 58C.            Innermost petals, inner surface — White Group 155C, and            striped with Red Group 47C. Innermost petals, outer surface            — White Group 155C, and striped with Red Group 53C. Basal            petal spots, after opening — No distinctive coloration at            the petal base. General Tonality — On open flower, Red Group            46D. No change in general tonality at the end of the fifth            day; thereafter the general tonality is White Group 155B            margined with Red Group 53C. Petaloids — Quantity — 7            petaloids per flower, on average. Dimensions — Variable;            approximately 12 to 20 mm long and 4 to 8 mm wide. Color,            inner surface — Red Group 43B to Red Group 54A. Color, outer            surface — White Group 155C and striped Red Group 46D.            Margins — Entire and indented. Shape — Cuneate. Apex —            Obtuse. Base — Attenuate. Texture, inner and outer surfaces            — Smooth.-   Reproductive organs:    -   -   Stamens.—Quantity — Approximately 50, on average, arranged            around the styles. Anthers — Shape — Reniform. Dimensions —            3.0 mm long and 0.5 mm wide, on average. Color — White Group            155A with intonations of Red Group 47C. Pollen — Present;            moderately abundant. Color is Yellow Group 8B. Filaments —            Color — Green-Yellow Group 1A. Length — 6 mm.        -   Pistils.—Quantity — Average; approximately 20. Stigmas —            Size — 0.5 mm. Location — Inferior in position to anthers.            Color — Yellow-Green Group 154C. Styles — Length —            Approximately 4.0 mm long. Color — Yellow-Green 145D.        -   Ovary.—Dimensions — 7 mm long and 4 mm in diameter. Color —            Green-White Group 157C.        -   Receptacle.—Shape — Funnel-shaped. Dimensions —            Approximately 10 mm high and 8 mm wide. Color — Yellow-Green            Group 144B with intonations of Greyed-Purple Group 184A.            Texture — Smooth; glabrous; lacking stipitate glands.-   Hips and seed formation: Not observed to date.

COMPARISONS WITH THE PARENTS

The new rose plant may be distinguished from its seed parent, Rosahybrida ‘KORschwill’, by the following combination of characteristics:

-   -   1. ‘KORbaymun’ exhibits white flowers suffused with red and        irregularly striped and margined red, whereas the seed parent        exhibits red flowers.    -   2. ‘KORbaymun’ grows to approximately 90 cm tall, whereas the        seed parent grows to approximately 70 cm tall.

The new rose plant may be distinguished from its pollen parent, Rosahybrida ‘MACcastler’, by the following combination of characteristics:

-   -   1. ‘KORbaymun’ exhibits cupped flowers, whereas the pollen        parent exhibits pointed, elegant flowers.    -   2. ‘KORbaymun’ exhibits excellent disease resistance, whereas        the pollen parent exhibits average disease resistance.

COMPARISON WITH THE MOST SIMILAR ROSA CULTIVAR KNOWN TO THE INVENTOR

For a comparison, several physical characteristics of the Rosa hybridavariety ‘KORumneza’, a rose variety from the same inventor which isdescribed and illustrated in U.S. Plant Pat. No. 26,309, are compared to‘KORbaymun’ in Chart 1.

CHART 1 Characteristic ‘KORbaymun’ ‘KORumneza’ Corolla diameter at 75mm. 100 mm. anthesis. Petal count. 20 to 22. 15. Size of prickles onstems. 8 mm. 4 mm.

That which is claimed:
 1. A new and distinct variety of rose plant named‘KORbaymun’, as described and illustrated herein.